Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance, beginning of year, shares at Nov. 30, 2014		50,677,000
Balance, beginning of year at Nov. 30, 2014	$ 543,245	$ 507	$ 209,271	$ 347,193	$ (13,726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		226,000
Issuance of stock under employee stock purchase plan	4,431	$ 2	4,429
Exercise of stock options, shares		449,000
Exercise of stock options	8,369	$ 4	8,365
Vesting of restricted stock units and release of deferred stock units, shares		714,000
Vesting of restricted stock units and release of deferred stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(215,000)
Withholding tax payments related to net issuance of restricted stock units	(5,631)	$ (3)	(5,628)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	610	$ 2	608
Stock-based compensation	$ 24,004		24,004
Treasury stock repurchases and retirements, shares	(1,300,000)	(1,271,000)
Treasury stock repurchases and retirements	$ (32,868)	$ (13)	(13,625)	(19,230)
Net loss	(8,801)			(8,801)
Other comprehensive loss	(10,902)				(10,902)
Balance, end of year, shares at Nov. 30, 2015		50,580,000
Balance, end of year at Nov. 30, 2015	522,464	$ 506	227,424	319,162	(24,628)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		266,000
Issuance of stock under employee stock purchase plan	5,328	$ 3	5,325
Exercise of stock options, shares		260,000
Exercise of stock options	4,698	$ 2	4,696
Vesting of restricted stock units and release of deferred stock units, shares		700,000
Vesting of restricted stock units and release of deferred stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(156,000)
Withholding tax payments related to net issuance of restricted stock units	(3,984)	$ (2)	(3,982)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	489	$ 0	489
Stock-based compensation	22,541		22,541
Dividends declared	$ (6,067)			(6,067)
Treasury stock repurchases and retirements, shares	(3,100,000)	(3,113,000)
Treasury stock repurchases and retirements	$ (79,188)	$ (31)	(17,482)	(61,675)
Net loss	(55,726)			(55,726)
Other comprehensive loss	$ (3,933)				(3,933)
Balance, end of year, shares at Nov. 30, 2016	48,536,516	48,537,000
Balance, end of year at Nov. 30, 2016	$ 406,629	$ 485	239,011	195,694	(28,561)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under employee stock purchase plan, shares		220,000
Issuance of stock under employee stock purchase plan	4,900	$ 2	4,898
Exercise of stock options, shares		203,000
Exercise of stock options	5,108	$ 2	5,106
Vesting of restricted stock units and release of deferred stock units, shares		660,000
Vesting of restricted stock units and release of deferred stock units	7	$ 7
Withholding tax payments related to net issuance of restricted stock units, shares		(118,000)
Withholding tax payments related to net issuance of restricted stock units	(3,756)	$ (1)	(3,755)
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity	679	$ 0	679
Stock-based compensation	14,153		14,153
Dividends declared	$ (24,679)			(24,679)
Treasury stock repurchases and retirements, shares	(2,200,000)	(2,221,000)
Treasury stock repurchases and retirements	$ (73,936)	$ (22)	(10,729)	(63,185)
Net loss	37,417			37,417
Other comprehensive loss	$ 9,562				9,562
Balance, end of year, shares at Nov. 30, 2017	47,281,035	47,281,000
Balance, end of year at Nov. 30, 2017	$ 376,084	$ 473	$ 249,363	$ 145,247	$ (18,999)